scholarly journals Seasonal and Spatial Variation in Dissolved Heavy Metals in Liaodong Bay, China

2022 ◽  
Vol 19 (1) ◽  
pp. 608
Author(s):  
Weijun Guo ◽  
Jibing Zou ◽  
Sihong Liu ◽  
Xuewen Chen ◽  
Xiangpeng Kong ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Trace Metals ◽  
Trace Metal ◽  
Spatial Gradient ◽  
Trace Metal Concentration ◽  
Surface Seawater ◽  
Liaodong Bay ◽  
Pollution Levels ◽  
Four Seasons ◽  
Dissolved Heavy Metals

Spatial–seasonal variations in dissolved heavy metals in surface seawater were analyzed based on surveys at 87 sampling sites and water samples from six rivers across Liaodong Bay. The concentrations of copper (Cu), lead (Pb), cadmium (Cd), and zinc (Zn) had ranges of 0.20–40.00 (5.45 ± 5.67), 0.51–33.64 (4.68 ± 3.93), 0.03–13.47 (2.22 ± 2.01), and 0.50–80.09 μg/L (14.22 ± 16.32), respectively, throughout the four seasons of 2020. The trace metal concentration showed a spatial gradient of high to low from river to estuary and from inshore to offshore areas. A combination of pollution levels and marine sensitivity was employed to assess the pollution degree of the heavy metals. As a whole, the single pollution factors of trace metals in Liaodong Bay were ranged in the order Pb > Zn > Cu > Cd. The total pollution degree was relatively high in autumn and summer due to increased riverine inputs after the rainy season, while relatively low in spring and winter. These findings provide baseline data for future targeting policies to protect marine environments in Liaodong Bay.

scholarly journals Analysis of Trace Metal Contamination in Pahang River and Kelantan River, Malaysia

2019 ◽  
Vol 266 ◽  
pp. 04003 ◽  
Author(s):  
Norpadzlihatun Manap ◽  
Kavitha Sandirasegaran ◽  
Noor Shahifah Syahrom ◽  
Amnorzahira Amir
Keyword(s):  
Trace Metals ◽  
Trace Metal ◽  
Metal Contamination ◽  
Sediment Quality ◽  
Primary Objective ◽  
Trace Metal Concentration ◽  
Trace Metal Contamination ◽  
Quality Guidelines ◽  
Fish Samples ◽  
Negative Impacts

The primary objective of this study is to determine trace metal contamination in environmental samples obtained from Pahang River and Kelantan River, Malaysia which may help to identify the risk of sustainable dredging in these areas. This research also proceeds to compare the trace metal concentration with the National Water Quality Standards of Malaysia, Interim Canadian Sediment Quality Guidelines and Malaysian Food Act 1983 to determine its limits and risks. Samples of water, sediment, snails and fishes were collected and analyzed for As, Cu, Cd, Cr, Fe, Pb, Ni, Mn, and Hg by using atomic absorption spectrophotometer. It was found that the concentration of trace metals namely As, Cu, Cd, Cr, Pb, Ni, and Hg in river water, sediment, snail and fish samples in Pahang River were lower than the maximum allowable limits, except for Fe and Mn. In Kelantan River, the concentration of trace metals indicating that it is contaminated with Fe, Mn, Pb, Cr, Cu, Hg, and As as all trace metals exceeded the maximum allowable limits. Negative impacts may arise, and the river may contaminate more in future if there is no proper management to tackle this issue during execution of dredging activities.

scholarly journals Characteristics of Atmospheric Metalliferous Particles during Large-Scale Fireworks in Korea

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Zang-Ho Shon ◽  
Ju-Hee Jeong ◽  
Yoo-Keun Kim
Keyword(s):  
Trace Metals ◽  
Trace Metal ◽  
Large Scale ◽  
Background Level ◽  
Trace Metal Concentration ◽  
Urban Background ◽  
Ambient Concentration ◽  
Local Background ◽  
The Impact ◽  
Concentration Levels

The effect of large-scale firework events on urban background trace metal concentrations was investigated using 24 hr data collected over 3 days at three sites in Busan Metropolitan City, Republic of Korea, during the falls (Oct.) of 2011–2013. The firework events increased local background concentrations of trace metals as follows: K (1.72 times), Sr (2.64 times), As (2.86 times), Pb (2.91 times), and Al (5.44 times). The levels of some metals did not always drop to background level one day after the firework event. The contribution of fireworks to trace metal concentration levels (and emissions) for 2011 event was negligible compared to 2012 and 2013 events due to different meteorological conditions (precipitation). In addition, the impact of firework events on the ambient concentration levels of trace metals was likely to be different depending on their chemical speciation. The impact of firework events in Busan on urban air quality (trace metal) was less intense compared to other similar festivals worldwide. The largest emission of trace metals and elements from firework burning was represented by K (128–164 kg), followed by Pb, Cd, Cu, Mg, Ba, As, Al, Ga, Co, and Na.

Response of diffusive equilibrium in thin films (DET) and diffusive gradients in thin films (DGT) trace metal profiles in sediments to phytodetritus mineralisation

2012 ◽  
Vol 9 (1) ◽  
pp. 41 ◽  
Author(s):  
Yue Gao ◽  
Martine Leermakers ◽  
Annelies Pede ◽  
Aurelie Magnier ◽  
Koen Sabbe ◽  
...  
Keyword(s):  
Thin Films ◽  
Trace Metals ◽  
Trace Metal ◽  
Phytoplankton Bloom ◽  
Marine Ecosystem ◽  
Trace Metal Concentration ◽  
Water Interface ◽  
Overlying Water ◽  
Study Laboratory ◽  
Diffusive Gradients

Environmental contextContaminated sediments can have a large and lasting effect on marine ecosystems. It was discovered that significant amounts of pollutants, especially arsenic, were released from contaminated sediments during a phytoplankton bloom in the Belgian Continental Zone. Once released to the water column, these pollutants can accumulate up marine food chains and be a source of contaminants to humans. AbstractField data from the Belgian Continental Zone showed elevated trace metal concentrations at the sediment–water interface after the occurrence of a phytoplankton bloom. In the present study, laboratory incubation experiments were used to investigate the effect of the phytodetritus remineralisation process on the release of trace metals from contaminated muddy sediments. This remineralisation process was followed by the measurement of chlorophyll-a and dissolved organic carbon levels in the top sediment layers. Two gel techniques, diffusive equilibrium in thin films (DET) and diffusive gradients in thin films (DGT), were used to assess vertical metal profiles in the sediment pore waters and to calculate the metal effluxes. These metal effluxes compared very well with the trace metal concentration variations in the overlying water of the sediment. Much higher effluxes of Mn, Co and As were observed after 2 days of incubation in the microcosms which received additions of phytodetritus. This trend gradually decreased after 7 days of incubation, suggesting that the elevated efflux of trace metals was proportional to the quantity of phytodetritus mineralised at the sediment–water interface. The release of large amounts of toxic elements from the sediments after phytoplankton blooms can therefore potentially affect the marine ecosystem in the Belgian Continental Zone.

Trace metals load on beached microplastics in the anthropogenically influenced estuarine environment - Croatian middle Adriatic

2021 ◽  
Author(s):  
Vlado Cuculić ◽  
Hana Fajković ◽  
Željko Kwokal ◽  
Renata Matekalo
Keyword(s):  
Trace Metals ◽  
Trace Metal ◽  
Specific Surface ◽  
Anodic Stripping Voltammetry ◽  
Sampling Site ◽  
River Estuary ◽  
Mesh Size ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Surface Seawater

<p>Marine plastic litter can be a significant vector for ecotoxic trace metals into coastal areas. Eventually, it can be burried in sediment and in accumulated material on the beach with organic and inorganic material on its surface. In order to analyze the trace metal quantities (Cd, Cu, Pb and Zn) on different size particles in an anthropogenically affected environment, microplastics were sampled from the accumulated material on the Mala Martinska natural beach (Šibenik Bay, Croatia) in September 2019. The city of Šibenik and the Šibenik Bay are located in the lower part of the Krka River estuary (middle Adriatic). It is the main Croatian port for the phosphate ore import. Also, it was found earlier that Šibenik Bay was polluted by the ex-ferromanganese industry located in it, and the industrial slag spreading around the factory was the significant supply of trace metals in the Bay. The concentrations of dissolved and total metals in the surface seawater at the same location and at the reference point (coastal surface seawater at Jadrija, ~4 km SE from the sampling site) were determined in February and June 2020.</p><p>The collected material was sieved through a metal sieve with a 4 mesh size, resulting in 4 bulk (mixed microplastics) aliquots (> 4mm; 4-2 mm; 2-1 mm; 1-0.250 mm). From each of of the 4 bulk aliquots, subsamples of mixed plastics and polystyrene (PS) particles were isolated, resulting in 8 subsamples in total. The type of plastic particles (> 4mm; 4-2 mm and PS) was determined by FTIR spectroscopy performed on Bruker Tensor 27 in the region from 4000-400 cm<sup>-1</sup>. Trace metal concentrations on such defined particles and in seawater samples were determined using differential pulse anodic stripping voltammetry (DPASV) by Metrohm Autolab modular potentiostat/galvanostat Autolab PGSTAT204, connected with a three-electrode system Metrohm 663 VA STAND (Utrecht, The Netherlands). Working electrode used was static mercury drop electrode (SMDE).</p><p>In general, the amounts of trace metals associated with the plastic particles (Cd 0.02-0.35 µg/g; Pb 1.1-34.1 µg/g; Cu 1.7-32.9 µg/g and Zn 6-147 µg/g) were in the range of unpolluted and moderately affected sediments in the Adriatic Sea. The mass fractions of all tested trace metals increase with decreasing plastic particle size, probably due to the larger specific surface areas on the smaller particles. That was not the case for the plastic particles larger than 4 mm, both in mixed and PS samples, where the amounts of metal were higher compared to particles of 4-2 mm and 2-1 mm. Furthermore, all metals except cadmium showed a higher affinity for PS in comparison with mixed plastic samples of the same particle sizes (up to order of magnitude higher metal amounts), due to the PS highly developed specific surface area. In order to better understand the mechanism of association of trace metals with microplastics under different environmental conditions, further investigations are needed.</p><p>This work has been fully supported by Croatian Science Foundation under the project lP-2019-04-5832.</p>

scholarly journals Trace Metal and Cd Isotope Systematics of the Basal Datangpo Formation, Yangtze Platform (South China) Indicate Restrained (Bio)Geochemical Metal Cycling in Cryogenian Seawater

Geosciences ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 36
Author(s):  
Simon V. Hohl ◽  
Shao-Yong Jiang ◽  
Sebastian Viehmann ◽  
Wei Wei ◽  
Qian Liu ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Organic Matter ◽  
Trace Metals ◽  
Trace Metal ◽  
South China ◽  
Surface Seawater ◽  
Yangtze Platform ◽  
Metal Concentrations ◽  
Metal Cycling ◽  
Authigenic Minerals

The behaviour of bioavailable trace metals and their stable isotopes in the modern oceans is controlled by uptake into phototrophic organisms and adsorption on and incorporation into marine authigenic minerals. Among other bioessential metals, Cd and its stable isotopes have recently been used in carbonate lithologies as novel tracer for changes in the paleo primary productivity and (bio)geochemical cycling. However, many marine sediments that were deposited during geologically highly relevant episodes and which, thus, urgently require study for a better understanding of the paleo environment are rather composed of a mixture of organic matter (OM), and detrital and authigenic minerals. In this study, we present Cd concentrations and their isotopic compositions as well as trace metal concentrations from sequential leachates of OM-rich shales of the Cryogenian basal Datangpo Formation, Yangtze Platform (South China). Our study shows variable distribution of conservative and bioavailable trace metals as well as Cd isotope compositions between sequential leachates of carbonate, OM, sulphide, and silicate phases. We show that the Cd isotope compositions obtained from OM leachates can be used to calculate the ambient Cryogenian surface seawater of the restricted Nanhua Basin by applying mass balance calculations. By contrast, early diagenetic Mn carbonates and sulphides incorporated the residual Cd from dissolved organic matter that was in isotopic equilibrium with deep/pore waters of the Nanhua Basin. Our model suggests that the Cd isotopic composition of surface seawater at that time reached values of modern oxygenated surface oceans. However, the deep water Cd isotope composition was substantially heavier than that of modern fully oxygenated oceans and rather resembles deep waters with abundant sulphide precipitation typical for modern oxygen minimum zones. This argues for incomplete recycling of Cd and other bioavailable metals shortly after the Sturtian glaciation in the redox stratified Cryogenian Nanhua Basin. Our study highlights the importance of sequential leaching procedures when dealing with impure authigenic sediments such as OM-rich carbonates, mudstones, or shales to achieve reliable trace metal concentrations and Cd isotope compositions as proxies for (bio)geochemical metal cycling in past aquatic systems.

Trace metals and the productivity of shelf waters off north west Australia

1984 ◽  
Vol 35 (5) ◽  
pp. 505 ◽  
Author(s):  
D Mackey
Keyword(s):  
Trace Metals ◽  
Trace Metal ◽  
Nutrient Enrichment ◽  
High Performance ◽  
Copper Ions ◽  
Total Concentration ◽  
Trace Metal Concentration ◽  
North West ◽  
Complexing Capacity ◽  
Fluorescence Measurements

Oceanographic measurements on the North West Shelf of Australia indicated that nutrient enrichment was derived from a combination of terrestrial run-off and interaction with the sediments. There was no evidence for upwelling. In situ fluorescence measurements suggested that the phytoplankton biomass was low and did not increase in regions of nutrient enrichment. On the continental shelf, the concentrations of copper, nickel and cadmium were typical of unpolluted waters and by using a reverse- phase high performance liquid chromatography absorbent (SEP-PAK), about 20% of the copper was found to be organically bound with smaller amounts of organically bound nickel, zinc and iron and even less organically bound cadmium, chromium and manganese. The copper-complexing capacity of the surface waters (5-10 nM) was comparable to the total concentration of trace metals liable to form organic complexes so that the trace metal speciation may change markedly with small changes in trace metal concentration or complexing capacity. Calculations show that the concentration of free copper ions is too low to have any adverse affects on the biota and it is suggested that the productivity of the water may be affected by the limited bioavailability of essential trace metals.

scholarly journals Recommendations for Ensuring Environmental Safety of Ecosystem Restoration After Fire

2020 ◽  
Keyword(s):  
Heavy Metals ◽  
Trace Metals ◽  
Trace Metal ◽  
Soil Properties ◽  
Raw Materials ◽  
Field Research ◽  
Environmental Safety ◽  
Hazardous Substances ◽  
Adsorption Analysis ◽  
Characteristic Features

Purpose. To find ways to improve the soil properties of forest ecosystems after the action of the pyrogen- ic factor: to propose technological measures to restore the quality and improve the soil properties of the ecosystem; to prove the effectiveness of using clay in soil cleaning as a sorbent. Methods. The introduction of clay as a potential sorbent for cleaning fertile soils from trace metals is proposed. The mineral composition of the clay was determined by X-ray phase analysis. Clay materials can be successfully used in adsorption cleaning technologies. The method of phytoremediation with the help of dandelion to concentrate trace metal was used also. The concentration of trace metal was determined by atomic adsorption analysis. Results. The task of the experimental study was to substantiate the possibility of using cheap natural clay raw materials without its prior activation to remove trace metals from the soil solution. In the case of post-pyrogenic relaxation of ecosystems under conditions of man-caused load, the soil in the restored area may be contaminated with VM and other hazardous substances. The clay of the Kharkiv region was chosen for the experiment. The experiment proved the effectiveness of the use of clay in soil purification as a sorbent, and phytoremediation of dandelion in relation to heavy metals. Thus, both technical and biological methods of VM sorption to prepare the soil for planting can be recommended for the restoration of the forest ecosystem after a fire. The proposed technological measures to restore the quality and soil properties of the ecosystem include the implementation of design and survey work, including field research; implementation of the state ecological research (monitoring); cleaning the affected area from damaged trees; reclamation of soil fertility of regenerative territories, provided by design of restoration, depending on characteristic features of damages of sites and the subsequent application of regenerative territories. Conclusions. At postpyrogenic relaxation of ecosystems, in the conditions of technogenic loading, the efficiency of using clay in soil cleaning as a sorbent and phytoremediation with dandelion in relation to heavy metals has been proved.

scholarly journals Assessment of trace metal in macroalgae and sediment of the Sundarban mangrove estuary

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Ayesha Siddiqua Asha ◽  
A. S. M. Saifullah ◽  
Md. Galal Uddin ◽  
Md. Shemul Sheikh ◽  
Muhammad Jasim Uddin ◽  
...  
Keyword(s):  
Trace Metals ◽  
Trace Metal ◽  
Significant Positive Correlation ◽  
Trace Metal Concentration ◽  
Monsoon Period ◽  
Period Analysis ◽  
Positive Correlation ◽  
Mangrove Estuary ◽  
Zn And Cu In ◽  
Sundarban Mangrove

AbstractThis study was carried out to assess the levels of trace metals (Fe, Zn, Mn and Cu) in the macroalgae and sediment of the Sundarban mangrove estuary in Bangladesh. In this connection, macroalgae, water and sediment samples were collected seasonally (pre-monsoon, monsoon and post-monsoon) for a year from the study area. The surface water of the estuary was found to be quite rich in NO3, PO4 and NH4, which is more than that of the sediment pore water. Trace elements were determined using an atomic absorption spectrophotometer. The amount of trace metals in the samples were found in the order of Fe > Mn > Zn > Cu. Enrichment factor was done for trace metals in sediment and showed non-crustal origin of Zn and Cu in the monsoon period. Analysis of variance revealed the seasonal variation of trace metal concentration in sediment (except Mn; p > 0.05) and macroalgae (except Zn; p > 0.05). Iron in sediment showed significant positive correlation both with Fe (r = 0.84, p < 0.05) and Mn (r = 0.87, p < 0.01) in macroalgae. Similarly, Cu in sediment demonstrated a significant positive correlation with Cu in macroalgae (r = 0.81, p < 0.01). The findings reveal a significant communication of metals in sediment and macroalgae.

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